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How to Make a View Source Button for Demo Pages

Would you like to Make a ‘View Source’ Button on your website? Click it, and you see the entire source code for the page you are looking at. It’s not a popup or a new tab, it just shows the source right there on the page. It works on pretty much all modern browsers, as long as it supports CSS3 :target. Breaks in IE 8 and down, but OK in IE 9.